Other Comprehensive Income - Change in Unrealized Gains and Losses on Available-for-Sale Securities (Detail) (USD $) In Thousands, unless otherwise specified	3 Months Ended
	Mar. 31, 2014	Mar. 31, 2013
Change In Unrealized Gains And Losses On Available For Sale Securities [Abstract]
Unrealized holding (losses) gains arising during the period, Before Tax Amount	$ 393	$ 55
Unrealized holding (losses) gains arising during the period, Tax Effect
Unrealized holding (losses) gains arising during the period, Net of Tax Amount	$ 393	$ 55